SageBrush
REJECT Fascism
I don't see that as a problem in itself.Yeah, impressive that part of the "energy density" is not contained in the paste
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I don't see that as a problem in itself.Yeah, impressive that part of the "energy density" is not contained in the paste
Looks like another desperate attempt to make hydrogen relevant. No word on the efficiency of the process.More hype: Powerpaste Stores Hydrogen Energy | State of Clean Hydrogen
Sounds good, except for this part:
Yeah, impressive that part of the "energy density" is not contained in the paste
You need to carry around water which needs to be factored into the "energy density".I don't see that as a problem in itself.
Sure, but the Gibbs free energy of water is 237 kJ/moleYou need to carry around water which needs to be factored into the "energy density".
Some arithmetic:
One liter of water at STP is 1000 grams
One mole of H2O is 18 grams
So about 5.5 moles of H2O per liter
Step 1. You need to extract H2 from some source. We all know if you want to get it cheap it has to be from fossil fuel extraction as a byproduct, or you expend a lot of energy to extract H2 from H2Owhich heats hydrogen with magnesium and stabilizers so the hydrogen can be stored in cartridges even at room temperature
The paste is made by combining hydrogen and magnesium into magnesium hydride, then adding an organic compound called an ester
where it reacts with water to release hydrogen at a dynamically controlled rate,
Step 1. You need to extract H2 from some source. We all know if you want to get it cheap it has to be from fossil fuel extraction as a byproduct, or you expend a lot of energy to extract H2 from H2O
I wonder how many miles per gallon - of water - it gets?More hype: Powerpaste Stores Hydrogen Energy | State of Clean Hydrogen
Sounds good, except for this part:
Yeah, impressive that part of the "energy density" is not contained in the paste
The output of the fuel cell is electricity and water.You need to carry around water which needs to be factored into the "energy density".
I wonder how many miles per gallon - of water - it gets?
Good point. I assume you'd have to carry some water to start the reaction and make up for any losses.The output of the fuel cell is electricity and water.
Vapour. You would need to waste some energy to condense itThe output of the fuel cell is electricity and water.
Actually, condensation releases energy. Enough to be worth capturing? Or perhaps the process they describe can simply use the water in vapor form?Vapour. You would need to waste some energy to condense it
Condensation requires energy in form of drag and pumps / fans consumption. Released energy you can use if you connect your hydrogen car to central district heating system pipe...Actually, condensation releases energy. Enough to be worth capturing? Or perhaps the process they describe can simply use the water in vapor form?
I still have a hard time understanding any advantage hydrogen has over other forms of green energy, it is expensive, dangerous and hard to find. The cost to set up a hydrogen fueling station is very expensive, and at this time good luck finding one.
Then even more of a reason to invest that money into wind and solar with battery storage.I agree with all of the above, except that hydrogen is not green energy. It all depends on how you produce it. It is not "hard to find." It is hard to produce. In nature, on Earth, hydrogen only exists bound into other substances, from simple H2O, water, which is abundant and everywhere, to complex hydrocarbons. The former requires more energy to release than you get from the H2, and the latter releases pollutants when you extract the H2.
Everything else you say is correct, and hydrogen is no good for energy. Unless, that is, they can solve the problem of controlled and confined thermonuclear reaction. If you can turn H into He in a controlled manner, you can get buckets of energy. They've been trying to do that for seventy years and they haven't figured it out yet.
Afterthought: There is a freely-available thermonuclear reactor we can draw energy from, and many of us here on TMC are using it today. So I guess, in a way, my car is powered by hydrogen now: Hydrogen fusion in the sun makes the light that hits my solar panels and charges my car and runs my home.
POV, and the same can be said for electricityhydrogen is not green energy.
It is not. It is inefficient to produceIt is hard to produce.